Flying boat



Dec. L. A. SANDERS 1,890,021

FLYING BOAT Filed March 30,' 1931 Ll/QVLZOT (A), fizmlm flan e N Patented Dec. 6, 1932 UNITED STATES PATENT OFFICE LUDWIG ADRIAN SANDERS, OF VOORBURG, NETHERLANDS, ASSIGNOB T0 JOHANN ANTON SANDERS, OF VOORBURG, NETHERLANDS, ANI) FRANS LAMBER'I" STOOT, OF

THE HAGUE, NETHERLANDS FLYING BOAT Application filed March 30, 1931, Serial No. 526,407, and in the Netherlands April 7, 1930.

The invention relates to the shape of a flying boat, and its object is to obtain various improvements over the constructions hitherto known.

According to the invention the central part of the lower half of the cross sections is confined to a curve which approaches a circular arc, which central part at both sides is joined by a short rectilinear horizontal part which parts merge into rectilinear or nearly rectilinear parts extending upwardly which oin the continuation of said curve by means of closely fitting transition parts.

A flying boat constructed according to the invention has very small resistance, as well in the air as in the water, combined with a large bottom strength. Another advantage is the capacity of easily starting from the water, the landing on the water surface taking place very gradually. As a boat the construction gives a large stability and a better seaworthiness than with the flying boats hitherto known.

An embodiment of the invention is illustrated in the accompanying drawing. The figure is a cross section.

The central part 1 of the lower half of the section is confined by a curve which has been drawn in the figure for convenience sake as an exact circular arc, but in practice is carried out as a curve, the shape of which approaches the circular arc, e. g. the top part of a parabola or ellipse. The part 1 is oined at both sides by a short rectilinear horizontal part 2. On these parts 2 the main longitudinal struts 5 are arranged. The parts 2 pass into rectilinear or nearly rectilinear rising parts 3 which, if the flying boat is floating on the water, will give a large stability to the same. The parts 3 by means of closely fitting transition parts a join the continuation 6 of the curve 1 on which finally the wings are arranged.

I claim;

1. A flying boat, wherein the lower portion of the cross section of the hull comprises a surface of revolution, this portion merging into a side portion which is substantially horizontal, thereafter into a substantially straight portion at an acute angle with the LUDXVIG ADRIAN SANDERS. 

